AN ANALYTICAL CALCULATION OF OUTPUT FACTORS FOR 6 AND 18 MV PHOTON BEAMS IN VARIAN 2100C/D LINEAR ACCELERATOR

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TAHMASBI BEYRGANI M.J.; BEHROUZ M.A.; HOSSEINI SEYED MOHAMMAD; SHEYKHI A.M.; KARBALAEI S.M.

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Journal: Jundishapur Scientific Medical Journal Year:2009 | Volume:8 | Issue:2 (61) Page(s): 197-205

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Title

AN ANALYTICAL CALCULATION OF OUTPUT FACTORS FOR 6 AND 18 MV PHOTON BEAMS IN VARIAN 2100C/D LINEAR ACCELERATOR

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Keywords

LINEAR ACCELERATORQ3

TAYLOR EXPANSIONQ3

OUTPUT FACTORSQ3

FIELD SIZEQ3

Abstract

Background and objective: Output factor (O.F.) is one of the important and influential quantities in the calculation of treatment time in radiotherapy. The calculation of O.F. by a polynomial formula has been considered by researchers since 1985. All the previous studies employed empirical/semi empirical formulae. In the present research we propose a formula based upon a logic base and physical principles.Materials and Methods: The function O.F(x.y) = ¦(x.y) could predict the OUTPUT FACTORS for radiation fields of Varian 2100C/D. One could change the variables in terms of v=1/x and u=1/y in the main function to obtain a new function g (u,v). Expanding Tailor's series for g (u,v) around point (10,10), and neglecting the second higher orders. According to this expansion and symmetry of the photon fields, the first and second orders of differentiation of the function are constant. One can measure the dose of at least three radiation fields for obtaining the constants O.F formula. The later formula could be used to calculate O.F for other radiation fields. These calculated results are compared with the experimental data.Results: The calculated O.F data for radiation fields 5×5 to 40×40 cm2 have been compared with the experimental data for radiation energies 6 and 18 MV.Conclusion: The difference between the calculated and experimental data for the small radiation fields is more than that for the large fields because dimension of ionization chamber is large compare with the FIELD SIZE. This error is not important since the usual FIELD SIZEs in radiotherapy are not small. Therefore this formula is suitable to be used in radiation therapy.

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APA: Copy

TAHMASBI BEYRGANI, M.J., BEHROUZ, M.A., HOSSEINI, SEYED MOHAMMAD, SHEYKHI, A.M., & KARBALAEI, S.M.. (2009). AN ANALYTICAL CALCULATION OF OUTPUT FACTORS FOR 6 AND 18 MV PHOTON BEAMS IN VARIAN 2100C/D LINEAR ACCELERATOR. JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL, 8(2 (61)), 197-205. SID. https://sid.ir/paper/12930/en

Vancouver: Copy

TAHMASBI BEYRGANI M.J., BEHROUZ M.A., HOSSEINI SEYED MOHAMMAD, SHEYKHI A.M., KARBALAEI S.M.. AN ANALYTICAL CALCULATION OF OUTPUT FACTORS FOR 6 AND 18 MV PHOTON BEAMS IN VARIAN 2100C/D LINEAR ACCELERATOR. JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL[Internet]. 2009;8(2 (61)):197-205. Available from: https://sid.ir/paper/12930/en

IEEE: Copy

M.J. TAHMASBI BEYRGANI, M.A. BEHROUZ, SEYED MOHAMMAD HOSSEINI, A.M. SHEYKHI, and S.M. KARBALAEI, “AN ANALYTICAL CALCULATION OF OUTPUT FACTORS FOR 6 AND 18 MV PHOTON BEAMS IN VARIAN 2100C/D LINEAR ACCELERATOR,” JUNDISHAPUR SCIENTIFIC MEDICAL JOURNAL, vol. 8, no. 2 (61), pp. 197–205, 2009, [Online]. Available: https://sid.ir/paper/12930/en

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